WO2009140985A1 - Accès aléatoire dans des systèmes d’utilisation de spectre flexible - Google Patents

Accès aléatoire dans des systèmes d’utilisation de spectre flexible Download PDF

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Publication number
WO2009140985A1
WO2009140985A1 PCT/EP2008/004141 EP2008004141W WO2009140985A1 WO 2009140985 A1 WO2009140985 A1 WO 2009140985A1 EP 2008004141 W EP2008004141 W EP 2008004141W WO 2009140985 A1 WO2009140985 A1 WO 2009140985A1
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WO
WIPO (PCT)
Prior art keywords
access
resources
network access
network
channel
Prior art date
Application number
PCT/EP2008/004141
Other languages
English (en)
Inventor
Frank Frederiksen
Preben Mogensen
Original Assignee
Nokia Siemens Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/EP2008/004141 priority Critical patent/WO2009140985A1/fr
Publication of WO2009140985A1 publication Critical patent/WO2009140985A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side

Definitions

  • the present invention relates to methods, apparatuses, computer program prod- ucts, and a system for providing random access to a wireless network environment.
  • 3G 3 rd generation
  • Spectral resources in wireless communications systems are assigned to operators in a fixed manner.
  • the scarce spectral resources could be used more efficiently if the assignment to the operators could be made with some flexibility.
  • Flexible Spectrum Use aims at adapting the available spectrum to a network to reflect the changes on the number of subscribers as well as on daily traffic patterns.
  • FSU should enable more versatile operation of the networks, for example, with varying traffic loads in the networks or with some operators providing more focused coverage than others.
  • FSU should provide enough system flexibility towards geographical differences in regulatory spectrum assignments.
  • FSU also aims at easing the deployment of multiple RATs at the launch of the system, even when spectrum is made available gradually according to increasing traffic demands. Such flexibility may turn out to be of particular importance for the systems requiring wide spectrum bands on frequencies suitable for efficient vehicular communications, e.g., below 6 GHz.
  • the FSU concept allows multiple operators to share the same frequency spectrum in a decentralized manner using policy based radio resource optimization. It is expected to be implemented in decentralized and uncoordinated manner, where there will be a lot of independent base stations (BS) or other access devices, potentially belonging to different operators, which are not connected to each other, but on the other hand they are targeting at sharing the same physical spectrum resources according to certain policies.
  • BS base stations
  • the problem of having such a flexible sharing of spectrum among several operators is that the users need to be informed on the current radio parameter configuration of the BS. Further, each user will need to know when and how to access the control channel whenever communication is needed between the BS and a mobile station (MS) or other terminal device. This requires transmission of some broadcast information, which will typically be sent on a broadcast channel (BCH).
  • BCH broadcast channel
  • the BCH is seen as a static entity, which is sent on a constant and periodical time-frequency resource and which will contain semi-static information - at least in typical cellular network configurations like for instance GSM (Global system for Mobile communication), UMTS (Universal Mobile Telecommunication System), and LTE (Long Term Evolution).
  • GSM Global system for Mobile communication
  • UMTS Universal Mobile Telecommunication System
  • LTE Long Term Evolution
  • said desired network access resources define a set of random access channels to select from for accessing said access device.
  • an apparatus comprising:
  • selection means for selecting desired network access resources based on at least one of channel estimation, measurement and sensing
  • said desired network access resources define a set of random access channels to select from for accessing said apparatus.
  • an apparatus comprising:
  • receiving means for receiving network access resources advertised from a wireless access network • receiving means for receiving network access resources advertised from a wireless access network
  • selection means for selecting a random access channel from said received network access resources based on an interference or quality measurement
  • the above methods may be implemented as a computer program product comprising code means for producing the respective above steps when run on a com- puter device.
  • the above apparatuses may be implemented as network elements or nodes, access devices, fixed or mobile terminal devices, or as modules, chips or chip sets provided in these nodes, elements or devices.
  • desired network access resources for reception are individually selected by access devices. These resources or channels can then be used as proposal for network access.
  • a terminal device can choose a desired access resource which makes the smallest interference into the rest of the network.
  • additional flexibility can be provided to the system, whereby the terminal device is enabled to take a more active role in selecting resources that are seen better or best fit for transmission of information for network access, rather than just using a predetermined access channel. This potentially improves network performance, e.g. in cases where network deployment is less coordinated.
  • desired transmission resources may be selected as well based on the at least one of channel estimation, measurement and sensing, and may be used by the access device for signaling the desired network access resources.
  • these transmission resources may comprise at least one broadcast channel for broadcasting the desired network access resources.
  • the selection of desired resources may be performed based on an estimated interference level.
  • the desired network access resources may comprise a list of random access channels.
  • Fig. 1 shows a schematic diagram indicating a network architecture in which the present invention can be implemented
  • Fig. 2 shows schematic block diagrams of a terminal device and an access device according to embodiments of the present invention
  • Fig. 3 shows a flow diagram of a terminal-side processing according to an em- bodiment of the present invention
  • Fig. 4 shows a flow diagram of a network-side processing according to an embodiment of the present invention
  • Fig. 5 shows a schematic representation of physical resources for a random access channel
  • Fig. 6 shows a two-dimensional frequency vs. time diagram which illustrates a network resource selection
  • Fig. 7 shows a schematic block diagram of a software-based implementation according to an embodiment of the present invention.
  • Fig. 1 shows a schematic diagram of a general network architecture in which the present invention can be implemented.
  • a radio access network 300 e.g., a cellular Universal Mobile Telecommunications System (UMTS) Terrestrial Access Network (UTRAN) according to the Long Term Evolution (LTE) or 3 rd Generation Partnership Project (3GPP) Release 8 standard, provides access to a user equipment (UE) or - more generally - a MS 10 via a first access device 20, such as a GSM and/or UMTS base station device (e.g. Node B) of a first operator, and a second access device 30, such as an enhanced Node B (eNB) according to LTE of a second operator.
  • a first access device 20 such as a GSM and/or UMTS base station device (e.g. Node B) of a first operator
  • a second access device 30 such as an enhanced Node B (eNB) according to LTE of a second operator.
  • eNB enhanced Node B
  • Fig. 5 shows a physical channel structure indicating physical resources for a random access channel (RACH).
  • RACH random access channel
  • the horizontal dimension corresponds to the time domain, while the vertical dimension corresponds to the frequency domain.
  • six access slot densities may be provided, e.g. 1/20ms, 1/10ms, 2/1 Oms, 3/10ms, 5/10ms or 10/10ms.
  • one to four time offsets are defined such that the same receiver can cope with more than one cell in a site (except with slot density 10/10ms).
  • the upper diagram of Fig. 5 shows a frequency division duplex (FDD) case, where uplink and downlink channels are separated in the frequency domain.
  • FDD frequency division duplex
  • two different RACH frequencies are provided at different timings next to a continuous physical uplink control channel (PUCCH).
  • PUCCH physical uplink control channel
  • the lower diagram of Fig. 5 shows a time division duplex (TDD) case, where up- link and downlink channels are separated in the time domain.
  • TDD time division duplex
  • simultaneous RACHs are needed at different frequencies, because there are less access slots in time.
  • a joint BCH and RACH structure provides several candidates for the MS to choose from when requesting initial access to the BS.
  • a BS e.g. the BSs 20, 30 of Fig. 1 , transmits a cell specific configuration on a set of broadcast channels, so that a listening MS, e.g. the MS 10 of Fig. 1 , is provided with a set of BCHs to listen to in case of other interfering transmitting units on the same resources.
  • the transmitted BCHs are adapted to advertise a set of candidate resources (e.g. RACH candidates) that the MS is allowed to use for transmitting its random access data. Based on this information, the MS can select a physical resource for RACH transmission according to the estimated interference situation at the MS, e.g., the MS can in principle estimate or sense interference levels at the suggested resources.
  • Fig. 2 shows schematic block diagrams of a terminal device or terminal (e.g. the MS 10) and a network node or network device (e.g. first or second access devices 20, 30) according to the embodiment of the present invention.
  • a received broadcast information is checked by a resource detection (RD) functionality or unit 15 for provision of a list or set of RACH resources coded in or added to a received data stream.
  • the resource detection functionality or unit 15 may be provided as a part of an RRC functionality which controls reception operation of a receiver part of a radio frequency (RF) front-end unit 16 which enables wireless transmission and reception via an antenna.
  • RF radio frequency
  • suitable BCH and RACH resources are determined at a resource indication (Rl) functionality or unit 22, e.g., based on channel measurements, estimations and/or sensing performed e.g. at the re- source indication functionality or unit 22.
  • Rl resource indication
  • the selected suitable RACH resources are incorporated in or added to a control message in a message control information (MCI) functionality or unit 23 and broadcast via an RF front-end unit 24 and an antenna, by using at least one of the selected BCH resources.
  • MCI message control information
  • Fig. 3 shows a flow diagram of a terminal-side processing according to an embodiment of the present invention, which could be implemented based on a processing routine executed in the MS 10.
  • step S101 a list of RACH resources is received via a BCH resource. Then, in step S102, interference or reception quality levels are estimated, and at least one desired RACH resource is selected in step 103 from the received list, based on the estimation results. Finally, in step S104, a network access is initiated by using at least one of the selected RACH resources.
  • Fig. 4 shows a flow diagram of a network-side processing according to an em- bodiment of the present invention, which could be implemented based on a processing routine in the access devices 20, 30.
  • step S201 a channel measurement, sensing or estimation is performed as a basis for selection of suitable TX channels (e.g. BCH resources) and RX channels
  • step S202 e.g. RACH resources
  • step S203 a list or set of selected RACH resources is generated.
  • step S204 the obtained set or list of RACH resources is broadcast by using at least one of the selected TX channels (e.g. BCH resources).
  • Fig. 6 shows a two-dimensional frequency vs. time diagram which illustrates the suggested principle in a TDD case, where the access device (e.g. BS) transmits in a downlink time period through a set of selected broadcast channels (BCH) to advertise a set of random access channels to a terminal device (e.g. MS).
  • BCH broadcast channels
  • the terminal device can choose from the received set of random access channels for transmission during an uplink period (indicated by the bolt frame in Fig. 6).
  • the uplink and downlink directions are separated in time (TDD system)c- while the same frequency resources are used for both link directions.
  • multiple access devices e.g. BSs
  • BSs multiple access devices
  • RACH random access channel
  • the RACH physical resources defined through the BCH such that the set of potential RACH resources can be advertised based on the estimated interference level at the access device.
  • Fig. 7 shows a schematic block diagram of an alternative software-based implementation of the above embodiment and its implementation examples for achieving a dynamic control channel structure.
  • the required functionalities can be im- plemented in a processing unit 210, which may be any processor or computer device with a control unit which performs control based on software routines of a control program stored in a memory 212.
  • the control program may also be stored separately on a computer-readable medium.
  • Program code instructions are fetched from the memory 212 and are loaded to the control unit of the processing unit 210 in order to perform the processing steps of the above functionalities of Figs. 2 to 4, which may be implemented as the above mentioned software routines.
  • the processing steps may be performed on the basis of input data Dl and may generate output data DO.
  • the input data Dl may correspond to obtained channel interference or quality, and at the terminal side the input data Dl may correspond to the received set or list of RACH resources. Furthermore, at the network side the output data DO may correspond to a message or signalling with the added list or set of offered RACH resources and at the terminal side the output data DO may correspond to the selected RACH resource.
  • the above embodiments may be implemented as a computer program product comprising code means for generating each individual processing step when run on a computer device or data processor of the first and second access devices 20, 30 or terminal device (e.g. MS 10), respectively.
  • desired network access resources are selected based on at least one of channel estimation, measurement and sensing at an access device of a wireless access network, and the desired network access resources are advertised from the access device to a wireless terminal device, wherein the desired network access resources define a set of random access channels to select from for accessing the access device.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne des procédés, des appareils, un système et un programme informatique destinés à fournir un accès à un réseau d’accès sans fil. Les ressources d’accès au réseau souhaitées sont sélectionnées en fonction d’au moins une estimation et/ou une mesure et/ou une détection de canal au niveau d’un dispositif d’accès (20, 30) d’un réseau d’accès sans fil et les ressources d’accès au réseau souhaitées sont annoncées de la part du dispositif d’accès (20, 30) à un dispositif terminal sans fil (10). Les ressources d’accès au réseau souhaitées définissent un ensemble de canaux d’accès aléatoire parmi lesquels une sélection peut être faite afin d’accéder au dispositif d’accès (20, 30).
PCT/EP2008/004141 2008-05-23 2008-05-23 Accès aléatoire dans des systèmes d’utilisation de spectre flexible WO2009140985A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/004141 WO2009140985A1 (fr) 2008-05-23 2008-05-23 Accès aléatoire dans des systèmes d’utilisation de spectre flexible

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/004141 WO2009140985A1 (fr) 2008-05-23 2008-05-23 Accès aléatoire dans des systèmes d’utilisation de spectre flexible

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001093462A1 (fr) * 2000-06-02 2001-12-06 Samsung Electronics Co., Ltd. Procede de selection de canal d'acces aleatoire dans un systeme de communications mobiles amrc
EP1744577A1 (fr) * 2004-06-10 2007-01-17 Matsushita Electric Industrial Co., Ltd. Dispositif terminal de communication, dispositif de station de base et systeme de communication radio

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001093462A1 (fr) * 2000-06-02 2001-12-06 Samsung Electronics Co., Ltd. Procede de selection de canal d'acces aleatoire dans un systeme de communications mobiles amrc
EP1744577A1 (fr) * 2004-06-10 2007-01-17 Matsushita Electric Industrial Co., Ltd. Dispositif terminal de communication, dispositif de station de base et systeme de communication radio

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